special
Where special is the path-name for the special device that corresponds to a SCSI scanner. For SCSI scanners, the special device name must be a generic SCSI device or a symlink to such a device. Under Linux, such a device name could be /dev/sga or /dev/sge , for example. See sane-scsi (5) for details.
For USB scanners the devicename must contain the keyword "usb", as in /dev/usbscanner or /dev/usb/scanner0 . For scanners that need a firmware upload before scanning add a line starting with "firmware" followed by the fully qualified path to your firmware file, e.g.
firmware @DATADIR@/sane/snapscan/firmware.bin
For further details read http://snapscan.sourceforge.net .
@CONFIGDIR@/snapscan.conf The backend configuration file (see also description of SANE_CONFIG_DIR below).
@LIBDIR@/libsane-snapscan.a The static library implementing this backend.
@LIBDIR@/libsane-snapscan.so The shared library implementing this backend (present on systems that support dynamic loading).
SANE_CONFIG_DIR This environment variable specifies the list of directories that may contain the configuration file. On *NIX systems, the directories are separated by a colon (`:'), under OS/2, they are separated by a semi-colon (`;'). If this variable is not set, the configuration file is searched in two default directories: first, the current working directory (".") and then in @CONFIGDIR@ . If the value of the environment variable ends with the directory separator character, then the default directories are searched after the explicitly specified directories. For example, setting SANE_CONFIG_DIR to "/tmp/config:" would result in directories "tmp/config" , "." , and "@CONFIGDIR@" being searched (in this order).
SANE_DEBUG_SNAPSCAN If the library was compiled with debug support enabled, this environment variable controls the debug level for this backend. E.g., a value of 255 requests all debug output to be printed. Smaller levels reduce verbosity.
http://sourceforge.net/projects/snapscan/ (new development website)
Man page by Henning Meier-Geinitz (mostly based on the web pages and source code).